Table 1.

Variations of gut microbiome in anxiety.

Disorder	Subjects	Test	Increased levels	Decreased levels	Study
Anxiety	Mice	Gut microbiota analysis	Ruminiclostridium, Ruminococcaceae_UCG-014 Oscillibacter Clostridiales Clostridiaceae	Bacteroides Bacteroidaceae	Jin et al., (2021) [27]
Anxiety	Mice	Gut microbiota analysis	Ruminococcaceae	-	Kang et al., (2014) [28]
Anxiety	Mice	Gut microbiota analysis	Alistipes	-	Bangsgaard Bendtsen et al., (2012) [29]
Anxiety	Mice	Gut microbiota analysis	Citrobacter rodentium	-	Lyte et al., (2006) [30]
GAD	40 patients, age 21–55 36 HCs, age 21–55	Fecal microbiota analysis	-	Faecalibacterium Eubacterium Lachnospira Butyricicoccus Sutterella Bacteroidetes Ruminococcus gnavus Fusobacteium	Jiang et al., (2018) [32]

GAD—generalized anxiety disorder; HCs—healthy controls.